Sprocket wheel



May 8, 1923. 1,454,53$

EEEEEEEEEEE EL 7 Original Fi l 9 d O c t l 3 I 1 9 l9 ATTORNEYS PatentedMay 8, 1923. i

U S TA T E S CHARLES R. CARLETON, OF BROOKLYN, NEW YORK.

SPROCKET WHEEL.

Original application filed October 13, 1919, Serial No. 330,177. Dividedand this application filed May 1, 1920, Ser1a1 No. 378,333. RenewedApril 7, 1922. Serial'NO. 550,510.

proved Sprocket Wheel, of which the following is a full, clear, andexact description.

This invention relates to improvements in sprocket wheels, and moreparticularly to sprockets such as are used in connection with motionpicture films, an object of the invention being to provide a device ofthe character stated with removable teeth carrying ortions so that suchportions can be readily replaced or interchanged as may be desired.

This application is filed as a division of my original application forimprovements in film cleaning and polishing machines, filed October 13,1919, and given Serial No. 330,177. I

With these and other objects in view the invention consists in certainnovel features of construction, and combinations and arrangements ofparts, as will be more fully hereinafter described and pointed out inthe claims.

In the accompanying drawings- Figure l is a view in end elevationillustrating my improved sprocket wheel.

Figure 2 is a view in section on the line 22 of Figure 1.

1 represents the spool or body of my improved sprocket wheel and 2, 2,are rings secured to the ends of the body 1 by mean of clamping rings 3.The body 1 is provided with a central spindle receiving sleet-1e orbearing 1. and is made substantially hollow to reduce weight to aminimum.

The parts are secured together by means of screws 4, said screws havingsmooth portions 5 which project through the rings 3 and 2 and havethreaded portions 6 at their inner ends which engage in screw threadedopenings 7 in the drum or body 1. The outer ends or heads of the screws4 are preferably countersunk and provided with ordinary screwdriverreceiving grooves 8 for the reception of a screwdriver to adjust thesame.

The rings 2 are preferably of a metal differing from the metal of theother parts of the sprocket wheel and are provided on their peripheriesWith annular series of sprocket teeth 9 projecting beyond the outer faceor periphery of the body or spool 1.

In order that the teeth 9 of the rings 2 may properly register andprevent possibility of their improper connection with the body 1, a pin10 is projected through and has a fixed relationship to the body 1 withits ends projecting slightly beyond the ends of the body and adapted toenter openings 11 in the rings 2. Hence, these rings 2 can be positionedagainst the body only when then openings 11 are in register with theends of the pin 10 and when in such position, the teeth 9 of the pair ofrings will be in proper relative positions.

When the teeth 9 are worn, or when it is desired to provide the sprocketwheel with other shape or form of teeth, the rings 2 can be readilyremoved by first removing the screws 4 and new rings 2 with the properteeth, or simply with the same form of teeth, may be clamped in place asabove described.

It will thus be noted that with my improved sprocket wheel, I am enabledto util ze the same spool or body as the only portlon of the sprocketwheel which has any material wear is the teeth, and when the teeth areworn, new rings can be clamped in place, so that the expense ofproviding new sprocket wheels is entirely dispensed with.

It is, of course, to be understood that this form of sprocket wheel isto be utilized in any connection where it is desired to move a film orother analogous device, and I do not limit myself to any particular use.

Various slight changes might be made in the general form and arrangementof parts described without departing from the invention, and hence I donot limit myself to the precise details set forth, but consider myselfat liberty to make such changes and alterations as fairly fall withinthe spirit and scope of the appended claims.

I claim:

A sprocket wheel, comprising a body having reduced ends, a pin extendingaxially through the bodywith its ends projecting beyond the reduced endsof the body, a pair the ends of the pin and located against the of teethcarrying rings removably positioned first-mentioned rings, and screwsprojected V on the reduced ends of the body and having through the pairsof rings at the respective openings therein receiving the ends of theends of the body and screwed into the body 5 pin to maintain the teethof the rin 5 1n removably clamping the parts together.

alignment, securing rings on the re uced of the body covering theopenings and CHARLES R. CARLETON.

